STOCK BASED COMPENSATION - Balances of stock-based compensation plans (Details) shares in Thousands	6 Months Ended
	Jun. 27, 2020 $ / shares shares
Stock Options
Number of Options
Balance at the beginning (in shares) | shares	1,618
Granted (in shares) | shares	0
Exercised/released (in shares) | shares	(167)
Forfeited/expired (in shares) | shares	(117)
Balance at the end (in shares) | shares	1,334
Weighted Average Exercise Price
Balance at the beginning (in dollars per share) | $ / shares	$ 16.44
Granted (in dollars per share) | $ / shares	0
Exercised/released (in dollars per share) | $ / shares	8.34
Forfeited/expired (in dollars per share) | $ / shares	21.56
Balance at the end (in dollars per share) | $ / shares	$ 17.00
Performance-Based Restricted Stock Awards
Number of Shares
Balance at the beginning (in shares) | shares	0
Granted (in shares) | shares	166
Exercised/released (in shares) | shares	0
Forfeited/expired (in shares) | shares	(20)
Balance at the end (in shares) | shares	146
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share) | $ / shares	$ 0
Granted (in dollars per share) | $ / shares	32.84
Exercised/released (in dollars per share) | $ / shares	0
Forfeited/expired (in dollars per share) | $ / shares	32.84
Balance at the end (in dollars per share) | $ / shares	$ 32.84
Restricted Stock Units and Restricted Stock Awards
Number of Shares
Balance at the beginning (in shares) | shares	296
Granted (in shares) | shares	356
Exercised/released (in shares) | shares	(85)
Forfeited/expired (in shares) | shares	(96)
Balance at the end (in shares) | shares	471
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share) | $ / shares	$ 23.85
Granted (in dollars per share) | $ / shares	32.69
Exercised/released (in dollars per share) | $ / shares	23.00
Forfeited/expired (in dollars per share) | $ / shares	29.43
Balance at the end (in dollars per share) | $ / shares	$ 29.55
Deferred Stock Units
Number of Shares
Balance at the beginning (in shares) | shares	23
Granted (in shares) | shares	9
Exercised/released (in shares) | shares	0
Forfeited/expired (in shares) | shares	0
Balance at the end (in shares) | shares	32
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share) | $ / shares	$ 20.39
Granted (in dollars per share) | $ / shares	29.68
Exercised/released (in dollars per share) | $ / shares	0
Forfeited/expired (in dollars per share) | $ / shares	0
Balance at the end (in dollars per share) | $ / shares	$ 23.00